Macaroni and Cheese

1 to 1 1/2 cup uncooked pasta (elbow, rigatoni, shells, rotini, etc.)
1/4 cup butter
1 small onion, chopped
1/2 tsp salt
1/4 tsp pepper
1/4 cup flour
1 3/4 cup milk
8oz cubed Velveeta
1 cup shredded cheddar

Cook pasta according to package directions. Drain well and set aside.

Cook and stir butter, onion, salt and pepper over medium heat until onion is slightly tender. Blend in flour. Cook over low heat stirring for 1-2 minutes. Microwave milk for 2 minutes. Stir milk into butter mixture. Heat to boiling, stirring constantly. Boil and stir for 1 minute. Remove from heat (that part is important!). Stir in cheese until melted. Add cooked pasta and mix well.

Place 1 1/2 qt casserole dish. Cook uncovered at 375 for 30 minutes.